Dirt may be harder to remove from some crops than from others.

VOA: special.2009.06.09

But once these opportunities are discovered, it will be harder and harder to detect again, because opportunities get arbitraged out of the market.

VOA: standard.2010.08.05

They are not working in a coordinated fashion, but certainly they have got the message that if they don't do something soon, then the turmoil that we are seeing in Greece could easily spread to other countries and that it will be harder to turn around."

VOA: standard.2010.05.25

But the head of UNICEF, Anthony Lake,says: "Unless we all work harder, there may still be fifty-six million children out of school in two thousand fifteen."

VOA: special.2010.05.20

Fars News Agency reports that the Ayatollah wants Iranians to work harder, use more initiative and be more creative.

VOA: standard.2010.07.23

The Latvian economy is expected to be hit even harder,shrinking 13.1 percent in 2009, while Ireland's economy is expected to shrink by nine percent.

VOA: standard.2009.05.04

"Unless we all work harder, there may still be out of school in 2015.

VOA: standard.2010.05.19